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-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
index ca9314ec99..cffa2387de 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
@@ -1,3 +1,4 @@
+require 'thread'
require 'monitor'
require 'set'
require 'active_support/core_ext/module/synchronization'